C# 0 The Complete Reference

Sample.cs

,

Test.cs

, or even 

X.cs

.

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P a r t   I :  

T h e   C #   L a n g u a g e

By convention, C# programs use the 

.cs

 file extension, and this is a convention that you 

should follow. Also, many programmers call a file by the name of the principal class defined 

within the file. This is why the filename 

Example.cs

 was chosen. Since the names of C# 

programs are arbitrary, names won’t be specified for most of the sample programs in this 

book. Just use names of your own choosing.

The program begins with the following lines:

/*

   This is a simple C# program.

   Call this program Example.cs.

*/

This is a 

comment.

 Like most other programming languages, C# lets you enter a remark into 

a program’s source file. The contents of a comment are ignored by the compiler. Instead, a 

comment describes or explains the operation of the program to anyone who is reading its 

source code. In this case, the comment describes the program and reminds you to call the 

source file 

Example.cs

. Of course, in real applications, comments generally explain how 

some part of the program works or what a specific feature does.

C# supports three styles of comments. The one shown at the top of the program is called 

a

multiline comment.

 This type of comment must begin with